package com.zsr.service.impl;

import com.zsr.dao.BookDao;
import com.zsr.dao.OrderDao;
import com.zsr.dao.OrderItemDao;
import com.zsr.dao.impl.BaseDao;
import com.zsr.dao.impl.BookDaoImpl;
import com.zsr.dao.impl.OrderDaoImpl;
import com.zsr.dao.impl.OrderItemDaoImpl;
import com.zsr.pojo.*;
import com.zsr.service.OrderService;

import java.util.Date;
import java.util.Map;

public class OrderServiceImpl implements OrderService {
    private OrderDao orderDao = new OrderDaoImpl();
    private OrderItemDao orderItemDao = new OrderItemDaoImpl();
    private BookDao bookDao = new BookDaoImpl();
    /**
     * 生成订单
     *
     * @param cart
     * @param userId
     * @return
     */
    @Override
    public String createOrder(Cart cart, Integer userId) {
        // 订单号===唯一性
        String orderId = System.currentTimeMillis() + "" + userId;
        // 创建一个订单对象
        Order order = new Order(orderId, new Date(), cart.getTotalPrice(), 0, userId);
        // 保存订单
        orderDao.saveOrder(order);

        // 遍历购物车中每一个商品项转换成为订单项保存到数据库
        for(Map.Entry<Integer, CartItem> entry:cart.getItems().entrySet()){
            // 获取每一个购物车中的商品项
            CartItem cartItem = entry.getValue();
            // 转换为每一个订单项(id自增)
            OrderItem orderItem=new OrderItem(null,cartItem.getName(),cartItem.getCount(),cartItem.getPrice(),cartItem.getTotalPrice(),
                    orderId);
            // 保存订单项到数据库
            orderItemDao.saveOrderItem(orderItem);
            int i=1/0;
            // 更新库存和销量
            Book book = bookDao.queryBookById(cartItem.getId());
            book.setSales( book.getSales() + cartItem.getCount() );
            book.setStock( book.getStock() - cartItem.getCount() );
            bookDao.updateBook(book);
        }

        // 清空购物车
        cart.clear();
        return orderId;
    }
}
